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I don't think I've ever seen a single post about a bad battery due to not charging for the first four full hours. I actually started using my first X5 right out of the box without charging at all (until I noticed the battery was at 30-something %), and that battery didn't even experience poor performance, lasting over 11 hours with the today screen on low brightness in a test.
charging for 4 hours may increase the number of charges available, but it does not see to affect actual usage time a hair.
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